I think the active ingredient is the papain, which is an enzyme that
digests protein.   I don't know how it helps bee stings.
 
I would be awfully careful about how you recommend this 'cure'
to someone.  I expect it helps for pain, but I wouldn't for
a MINUTE EVER suggest it for someone who has allergic reaction
to stings.  These people need a different remedy, which they
are supposed to carry with them just in case, which other
people on this list can probably tell you about.  (I'm not
allergic, so ignorant.)
 
Liz Day
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Indianapolis, Indiana, central USA